electrical engineering MCQs – Page 317

Practise multiple-choice questions from electrical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

electrical engineering Mcqs
1. economics of power generation2. analog electronics3. solid state switching circuits4. parallel circuits5. switchgear and protection6. op amp circuits7. transistor audio power amplifiers8. electrostatics9. heating and welding10. multi stage transistor amplifiers11. passive filters12. network theorems13. regulated d c power supply14. a c fundamentals circuits and circuit theory15. electromagnetic induction16. power electronics17. magnetism and electromagnetism18. transformers19. modulation and demodulation20. d c generators21. semiconductor theory22. single phase induction motors23. semiconductor diode24. hybrid parameters25. digital electronics26. oscillators27. earthing or grounding28. single stage transistor amplifiers29. d c motors30. transistor biasing31. amplifiers with negative feedback32. basic electrical33. electronic instruments34. synchronous motors35. field effect transistors fet36. magnetic circuit37. control systems38. industrial drives39. power generation40. series parallel circuits41. transistor tuned amplifiers42. electrical engineering materials43. rectifiers and converters44. integrated circuits45. scr silicon controlled rectifiers46. cables47. polyphase induction motors48. measurement and instrumentation49. transistors50. electrical machine design51. electrolysis and storage of batteries52. electric traction53. transmission and distribution
6321. The voltage of a single solar cells is about
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A. 1. 5 volt

B. 1 volt

C. 1.8 volt

D. 0.5 volt
6322. A steam power stations basically work on the______________?
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A. thermodynamic cycle

B. Vapor pressure cycle

C. Carton cycle

D. Rankin cycle
6323. The percentage 02 by volume in atmosphere air is____________?
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A. 77%

B. 79%

C. 21%

D. 23%

6324. The cooling section in the surface condenser__________?
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A. does not affect vapour quantity extracted but reduces pump capacity of air extraction pump

B. increases the quantity of vapour extracted along with air

C. reduces the quantity of vapour extracted along with air

D. none of the above

6325. The ratio of exit pressure to inlet pressure for maximum mass flow rate per unit area of steam through a nozzle when steam is initially dry saturated is___________?
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A. 0.555

B. 0.6

C. 0.5457

D. 0.578
6326. The pressure at the furnace is minimum in case of___________?
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A. forced draught system

B. natural draught system

C. balanced draught system

D. induced draught system

6327. The amount of air which is supplied for complete combustion is called___________?
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A. primary air

B. tertiary air

C. secondary air
6328. Load carrying capacity of belt conveyor is about___________?
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A. 100 to 150 tonnes/hr

B. 20 to 40 tonnes/hr

C. 50 to 100 tonnes/hr

D. 150 to 200 tonnes/hr

6329. The isentropic expansion of steam through nozzle for the steam initially superheated at inlet is approximated by equation__________?
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A. pv = C

B. pv1126 = C

C. pv1A = C

D. pvls=C
6330. The proper indication of incomplete combustion is_______________?
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A. high CO content in flue gases at exit

B. high CO2 content in flue gases at exit

C. the smoking exhaust from chimney

D. high temperature of flue gases

6331. The value of reheat factor normally varies from___________?
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A. 1.02 to 1.06

B. 0.9 to 0.95

C. 1.2 to 1.6

D. 0.5 to 0.6

6332. Economiser is used to heat_____________?
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A. all above

B. air

C. feed water

D. flue gases

6333. Where unpulverised coal has to be used and boiler capacity is large, the stoker which is used is______________?
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A. underfeed stoker

B. overfeed stoker

C. any

6334. Rankine cycle efficiency of a good steam power plant may be in the range of____________?
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A. 35 to 45 per cent

B. 70 to 80 per cent

C. 15 to 20 per cent

D. 90 to 95 per ceut

6335. In case of impulse steam turbine_____________?
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A. there is enthalpy drop only in moving blades

B. there is enthalpy drop in nozzles

C. there is enthalpy drop in fixed and moving blades

D. none of the above

6336. In _________ system fuel from a central pulverizing unit is delivered to a bunker and then to the various burners?
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A. unit

B. none of the above

C. central
6337. Caking coals are those which__________?
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A. do not form ash

B. burn completely

C. burn freely

D. form lumps or masses of coke
6338. Steam pressure in a steam power station, which is usually kept now-a-days is of the order of____________?
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A. 50 kgf/cm2

B. 100 kgf/cm2

C. 20 kgf/cm2

D. 150 kgf/cm2
6339. The thermal efficiency of the engine with condenser as compared to without condenser, for a given pressure and temperature of steam, is_____________?
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A. lower

B. higher

C. none of the above

D. same as long as initial pressure and temperature is unchanged

6340. For the safety of a steam boiler the number of safety valves fitted are____________?
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A. one

B. four

C. two

D. three